[KernelPanicNT]

What

sceSystemServiceInitializePlayerDialogParam now fills the param the way the console does. On main it returns 0 and writes nothing, so a title that initializes the param and then sets only the fields it needs passes uninitialized memory to sceSystemServiceLaunchPlayerDialog.

Source of the behaviour. A console measurement in prosper's console oracle (captured 2026-10-08, case). The call got a 256-byte buffer prefilled with 0xab and wrote only its first 0x40 bytes:

40 00 00 00 00 00 00 00  00 00 00 00 ff ff ff ff  00 ... 00 (to 0x3f)  ab ab ... (0x40..0xff untouched)

That is size 0x40 (u64), mode 0, user ID -1, and zeros. The field names and widths after 0x10 (target_account_id, 40 reserved bytes) and the void return follow SharpProspero's struct and declaration. The console left 0x0000000800693020 in rax, which is not an SCE error code, consistent with a void function.

On main, the export checks for null and returns 0. #292 added it for GTA V's Story Mode. PRAGMATA (PPSA02530) also imports it (#8005).

What the console does with a null param is not measured, so it now throws instead of returning 0x80A10003; it is recorded as debt.

Changes:

• SceTypes.hpp: SystemServicePlayerDialogParam (0x40 bytes, with a static_assert).
• Export.cpp: the export returns void, throws on null and writes the measured defaults.
• guest_system_service_tests: the measured bytes, the untouched bytes after 0x40, and the null throw.
• docs/dev/debt/libSceSystemService.md: a new entry for the null case.

Tested

Linux (GitHub Codespace, 4 cores, native build of this branch on d14a186f4):

• guest_system_service_tests: 5/5 runs pass.
• Negative control: with Export.cpp from main, guest_system_service_tests aborts with SIGABRT (the param is left unwritten); 5/5 pass again after restoring it.

Windows (fork CI, run 39403153111, this branch and an unrelated libSceNgs2 branch merged into main at d14a186f4): build and the full test suite pass, 1734/1734.

Checks:

• python3 tools/check_conventions.py --base origin/main passes.
• python3 tools/pr_overlap.py --branch feat/systemservice-player-dialog-param: reports no overlapping change. It could not compare Macos port #7201, feat(libSceAudioOut): implement sceAudioOutGetSystemState #5965, feat: run PS4 games on the AGC driver — Limbo (CUSA01664) in game (integration branch) #6977, fix(libs): share Sony CRT handler and lconv state between libc and libSceAmpr #7081, fix(avplayer): report frame rate and colour info in extended video details #7412 and test: organize library tests and label CTest suites #6044, which conflict with main; checked by hand: Macos port #7201 (macOS port) changes LoadExec code in the same Export.cpp, the four SceTypes.hpp PRs change AudioOut, VideoOut, lconv and AvPlayer structures, and test: organize library tests and label CTest suites #6044 reorganizes tests.
• tools/progress.py: unchanged (4246/6515 on base and head).

Checklist

• Based on current main (d14a186f4); no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Fixes: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

[github-actions]

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 5965	core/libs/SceTypes.hpp
PR 6044	core/libs/tests/GuestSystemService.cpp
PR 6977	core/libs/SceTypes.hpp
PR 7081	core/libs/SceTypes.hpp
PR 7201	core/libs/prx/libSceSystemService/Export.cpp
PR 7412	core/libs/SceTypes.hpp
PR 8354	core/libs/prx/libSceSystemService/Export.cpp docs/dev/debt/libSceSystemService.md
PR 8524	core/libs/prx/libSceSystemService/Export.cpp docs/dev/debt/libSceSystemService.md